Screening apparatus.



Patented ()Ct. 24, 1916.

4 SHEETS-SHEET I.

OOOOOOO OQOOOO G; H. FRASER.

SCREENING APPARATUS.

APPLICATION FILED JUNE 10, 1915. I 1,202,377. Patented Oct. 24,1915.

4 SHEETS-SHEET 2.

Z V V f9 'IEINVENTORI WlTNESSES: M

4W 4 M 0. I

G. H. FRASER.

SCREENING APPARATUS.

APPLICATION nun my: :0. 1915.

1,202,377. Patented Oct. 24,1916.

4 SHEETS-SHEET 3.

. INVENTOR WJTNESSES:

"e; H. FRASER.

SCREENING APPARATUS.

APPLICATION FILED JUNE 10. I915.

1,2O2J3f7'7; v Patented Oct. 24,1916.

4 SHEETS-SHEET 4.

- Air WITNESSES.- i 9- MJM UNITED STATES PATENT. OFFICE.

GEORGE HOLT FRASER, OF NEW YORK, N. Y.

SCREENING arran'n'ros.

Specification of Letters Patent.

gPatented ocaza, 1916.

Original application filed September 24, 1908, Serial No. 454,804. Divided and this application filed June To all whom it may concern:

Be it known'that I, Gnoncn HOLT FRASER, a citizen of the United States, residing in the borough of Brooklyn, county of Kings, city and State of New York, have invented certain new and useful Improvements in Screening Apparatus, of which the following is a specification. This, application is a division of my application Serial No. 454,604, filed September 24, 1908. v Thislinvention relates to screens for sepa- -rating .coarse from fine materials, and aims to provide certain lmprovement's therein.

The invention is especiallyapplicable to inclined screens of material. to, be screened is distributed across the upper end of the screen by a screw con- ;veyer and flows. down the screen While the latter-is vibrated to prevent clogging. Suchinclined screens are usually adjustable to vary the steepness of the screen, and are i usually supported by springs and vibrated the line 6-6 of by eccentrics or hammers.

This invention aims to provide screens of more nearly universal in adaptation to the particular requirements of justment and renewal, and operation, than heretofore.

To this end the invention provides vari ous' improvements which shall be hereinafter more fully set forth with reference to the-accompanying drawings, in which,

more effective in .Flgure 1 is a side elevation ofthe'preferred form of my invention; Fig. 2 is a rear elevation thereof partly broken away to show the machine 1n section on substantially I the planes of the line 2-2 in Fig. 1. Fig. 3

1s a vertical section thereofcut on the line 3-3 in Fig. 2 and looking in the direction of the arrow; Fig. 4 is afr-agmentary perspective view of the feed hopper and trough; Fig. 5 is a cross-section cut on the line 5-5 in Fig. 1 and looking in the direction of the arrow; Fig. 6 is a cross-section cuton Fig. 3 and looking in the direction of the arrow; Fig. Tis fragmentary face view of one of in" screen frames partly broken away and 0:; a larger scale; Fig. 8 is a fragmentary sectioii thcreof, and

10, 1915. Serial No. 38,294.

the class in which the use, more easily accessible for ad- Fig.9 is a fragmentary sectional view of the knocking device, spective view of the feedtrough, and Fig. 11 a simil'ar'view of .a modification of the trough.

and Fig. 10 is a per- Referring tothe drawings, A is. the feed hopper, feed, C the drive pulley, D the drive shaft, E the feed trough, F the rear feed plate, G the front feed plate, H thescreen carrier, I the screens, J the vibrators, K the springs, L the fine outlet, M the coarse outlet, N the side walls, 0 the door, Q the lower door, R the back door, S the. front and rear doors, T the feet, and U the. legs.

The material to be screened enters the hopper and is pushed along the trough by the revolving conveyor, which throws it over the edge ofthe trough as it.travels, so that it falls onto the feed plate in a substantially uniform quantity at all points throughout.

the width of the screen. The material slides down the 'feed plate and onto the screen .cloth, down which it flows, the fine material passes through the outlet M. The screen is and is adjusted vibrated to prevent clogging, up or down on the legs U steepness.

As shown, the hopper-A is a casting. havto the desired B the conveyer for distributing the bottom wall, P the top,

ing flanges a depending at front and at rear of the conveyer, SIdQ' flanges b above the Convey and top flanges cfsurrounding its inlet for receiving the end ofa chute, and is adapted to be placed at either .end or at the middle of the separator and to receive feed from any direction. c

As shown the feed trough is provided with discharge edgesd at both its front and rear sides, which edges are inclined from the feed polnt downwardlytoward the end and are adjustable in inclination so that the angle of the edge'may be suited to cause a uniform discharge of material throughout the length of the trough. is. made with reverse inclined edges, so that Preferably the trough,

when the hopper is at one end and the conveyer revolved in .one direction, the material can be discharged over the rear edge of the trough, and when the hopper is at the by retaining screws 0 which hold it in place.

At each end at the low side the trough is cut out to form an outlet 1 for any material that has not been thrown overthe edge, and

this'outlet at the hopper end is closed by a shield g pivoted to the hopper at h and engaged by-the adjacent screw 6, which shield 1 it is discha prevents material falling through the hoper from escaping at this side of the trough. ith this construction it ispossible to place the hopper at, either end of the trough and run the conveyer in either direction, so that it willfeed the material over the edge which inclines downwardly from the hopper, thus making itimmatenal whether the drive is rightor left hand. I

5; ,A shown two feed plates are -provided be neath the conveyer, the rear plate F receiving"the material from the trough E when (1 over the rear edge of the "trough and irecting it forwardly down onto the screen, andithe front plate G receiving the material when it is discharged over the front edge of the trough and directing it backwardly onto the plate F,.from which it slides onto the screen, so that the material is delivered to the screen in the same manner whether the discharge is over the front or the rear edge of'the feed trough. The plates F and G incline toward each other in order to bring the material always to the same place for delivery to the screen. When the material is discharged over the front edge of the trough, to prevent the fall of the materialdirectly onto the screen, the hinged edge h"; of the plate F will be used on the rear plate, but when the material is to be fed over the rear edge of the trough the plates will be reversed, or the hinged edge ofthe plate F will be unhooked and fastened on the plate G, where it will hang thus enabling. the material to flow onto the screen nearer the uppermost end thereof.

This hinged edge restson the screen frame and is vibrated thereby.

According to'-one feature of improvement,

. the screen frame H consists of an open frame having grooved slideways i in which the va- *rious sections of the screen I slide and which they are guided. The adjacentedges of screen sections are engaged by clamping strips 1 held down by screws 70 passing between the sections and screwing into the slideways. At the sides I provide clamping angles 1 which fit against the side angles m of the spring frame and carry the fingers n by which the frame is depressed. The guides i and side angles m are united by a top angle 0 and a bottom angle 1), and the frame is adjustably maintained in position by hanging rods 9 hooking into screw eyes 1' so that the frame is free to move up and down. The spring frame is preferably held up against a stop wall 8 by the springs K through the medium of springrods consistby its lower bar p, when it can be swung down like a door and removed either throug the front or rear Several features of improvement are embodied in the agitating devices J, which consist of oscillating knockers v mounted on rocker shafts w and preferably having walls 'thus, freed it wil 'drop down until supported embracing the fingers n, and serrated strik-- ing faces which engage these fingers for repressing the screen. The faces a: and fingers n are preferably relatively disposed to permit variation of the depressing movement by adjusting the fingers toward or from the shaft by bending them or otherwise, so that when the fingers are in one position the. maximum movement will occur, and

when in another position the minimum move-' ment will occur, as indicated in dotted lines in Fig. 9. This device aims to depress the frame with a diminishing speed and to release it with an increasing speed, so that thescreen' will receive a sharp upward blow against the wall 8 when released. This is accomplished by oscillating the knocker v by the arm 31/ which is oscillated from a crank 2 on the drive shaft 1), the parts being preferably so disposed that the knocker engages the finger as the crank approaches the dead center, and releases the finger as the crank is moving toward the full throw position, the lost motion between the knocker and finger being arranged so that the knocker will be ineffective during its rapid movements, and effective during its slow movements, thus avoidingtoo great a vibration of the spring frame and preventing too much strain on the knocker. The knockerarms y are connected by a connecting rod a, and are connected with the crank by a pitman b. Each am preferablyhas an integral oil cup closed by a cover 03, and the pitman has a similar oil cup at its crank end.

Another feature of improvement consists 5 in constructing each end of the casing preferably of asingle casting having an inclined top flange e, a wall f extending therefrom to the wall 8, an outwardly ofl'set wall 9 below the wall 8, and a lower edge or flange h of greater angularity than the wall S, and

at its upper end with portion 2" having front and rear flanges j for supporting theplates F and G, and a defleeting flange 1 0 at the intersection of these flanges for overlapping the plates at this point and deflecting material inwardly to- .ward the screen. The trough bracket Z is formed or cast on the inner face i to'sup- 'portthe feed trough, and has ears for receivmg the adjusting screws e. Externally the side N has cylindrical brackets m spaced apart from the'wall to leave an air space .for the escape of dust, in which brackets fit bearings n having portions shaped like a segment ofa sphere, so that they may oscillate in any direction to 'aline themselves with I the 'shafts'they carry. These bearings have integral oilcups .0 provided with lugs for s I attaching them to the wall.

ends N united by a rigid bar-p" at the bot tom an bars space the ends and determine their po sitions. The bar 11 makes the division between-the fine outlet L and the coarse outlet and acts as a stop by engaging the lower fppf the. spring frame to prevent the frame'from vfalling downwardly when re-;

leased, and tosupport its lower end when the" frame is being swung up and down. The baifgf supports the feed plate'F' and carries thea ja'cen't top door S, the lower edge of which door is hinged to this bar and bent inwardly over the plate to'prevent leakage above'the latter. The back door R slides up under the bar 4" and has an inwardly bent end which rests on the inner face of the ,bar'

jgQ-f The-front plate G is. supported by an angle bar 8 which is boltedto" the top edge of the slides N and carries'the upper springs The lower springs K are carried by a 'T bar t which is bolted to the upper edges of the ends near their bottom. The top covers P :rest on the bars'8' t, and interveniie 'ing. cross bars'u and '0, there being preferably four of these covers. The lower cover Qrests on the bar t and on a front-bar w. .The.bottom :0 preferably is hinged at If in a' cavity-formed in the inner face of the side, and is" fastened against the edges of the sides and against the under side of the bar -q,-so that this bottom can be swung down to give access "beneath the screen.

an inwardly projected p the width thereof, I a rigid T-bar g at the top, which v justed to suit'any The'entire casing preferably is pivotally rods or compression members a" fastened in sockets in the side bars 6, and of such length that the frame cannot be distorted inwardly to less than its minimum width, but adapted to positively spread the frame- 'until the screen cloth is adjusted to the proper tightness. The bars are adjustably held in the sockets preferably by nails 0 engaging notches d which prevent the frames from bending apart sufiiciently to drop the bars. One end of each bar is screwthreaded and has a nut .e" which can be-screwed outwardly tospread the bars and stretch the cloth. The nut can then be held against unscrewing in any manner.

As thus far described the apparatus is adapted for any of the ordinary uses of such. devices, but when it is desired to collect the I product at either side or themiddle of the The casing is preferably composed of two screen instead of discharging it throughout provide a supplemental base;V. having'a conveyer W beneath the fine outlet and a conveyer X beneath the coarse outlet, which conv yers have hearings in castingsY and are dri en from the shaft by a' sprocket chain Z. These conveyers.

, have troughs consisting of two pieces 7"" and g, the latter having a notch in one endfor an outlet. These twopieces are arranged 1 end to end'with the notch in the centerorat eitherend of the conveyer, accordingto where discharge of the product is desired. The conveyers are identical with'the feed conveyer B, except that one is a right hand conveyer and the other a left hand conveyer,

and each is made in two equal pieces with the shafts eXtend'ng entirely through them to support the adjacent ends, so that if central'discharge is desired-for each lower con veyer, this can be accomplished by putting a piece of right hand and a piece of left hand conveyer on each shaft, whereas if end discharge is desired,'like pieces of conveyer will be put together. Should it be necessary to put the feed hopper at the center, two reverse pieces of conveyer will be used in the feed trough, and the feed conveyer will be used below. In such case it will be necessaryfor one of the lower conveyers to have an end discharge and the other a central discharge. In operation the apparatus may be adrequirements as feed, discharge angularity or extent of vibration.

It is accessible from front, rear, top or bottom. It can be ventilated by 0 ening the back door R and the front door or either of them. The greater steepness of the bottom will insure downflow of the fine material, even when the screen proper is adjusted below the usual stee ness. The screen frames can be removed in ividuall through the front or rear, or through the ttom or top.

For packing the feet and legs can be folded against the body, and great compactness obtained. Assembly and disconnection can be quickly effected, and adjustment of either spring pressure or extent of vibration is easily obtained. The drive pulley and vibrating arms can be placed on either side, and the oscillating bearings will rock in their brackets to compensate for any skewing of the frame due to uneven setting.

he various details of construction, arrangement and combination shown each constitute a feature of improvement/and a part of my invention, and it will be understood that I do not limit myself to the particular adaptation herein set forth as constituting the preferred form of my invention, since the same-may be avaiIed of in whole or in part, according to such modifications as the udgment of those skilled in the art may dictate, without departing from'the spirit of my invention.

I prefer to also use an adjustable knocking stop rod 11 over the middle of the screen, to limit vibration there due to the resiliency of the longitudinal and transverse bars or supports 2', o and p. This has the same effect as the flanges a.

While I have herein shown and described the feeder set forth the same is not claimed in this application, being the subject matter of claims in my application Serial No. 454,- 604, filed September 24, 1908, of which this application is a division.

I claim as my invention 1. In combination, a frame or casing, a removable inclined screen therein comprising a rectangular frame, a wire mes. screen clothing mounted thereon, resilient means under the downwardly inclined side edges of said frame affording supports on which said screen is separably mounted, means for depressing said screen, and means above and sustained by said supports for jarring said screen.

2. In combination, a frame or casing, a removable inclined screen thereon compri lng a resiliently mounted rectangular frame and wire mesh clothing stretched thereon,

resilient means under ,and affording supports for the edges of said frame, means above the edges of said frame for resisting upward movement thereof, and impact members for jarring said screen sustained thereon.

3. In combinat on, a frame or casing, removable inclined screens therein com rising a rectangular frame and wire mesh c othing mounted thereon, flexibl mounted longitudinal supports on whic said screens are separably fastened, impact members above said supports for jarring said screens, and swinging strikers within said casing, above and actlng downwardly on said members for percussively jarring said screens 4. In combination, a frame or casing, a removable inclined screen therein comprising an oblong rectangular screen frame and jarring it, and means for percussively acting on said members.

6. In combination, a frame or casing, is removable inclined screen thereon comprising a rectangular frame and wire mesh clothing mounted thereon, a flexible support on which said screen is removably mounted, an upwardly extending impact member mounted on said support for .jarring said screen, and a swinging striker acting percussively on said member, one of said latter parts being-adjustable.

7. In combination, a frame or casing,.a removable inclined screen therein comprising a rectangular screen frame and screen clothing mounted thereon, and a sufpport for the downwardly inclined edge 0 screen frame comprisin a downwardly eittending inclined mem er sustaining said screen and having a downwardly extending grove or recess on its upper side beneath the edge of said screen, and an impact member mounted on said screen. 1 I p 8. In combination, a frame or casing, a removable inclined screen therein, and a support for the downwardly inclined edges of said screen comprising downwardly extending inclined members beneath and sustaining said edges respectively, and each hav ng a downwardly extending groove or recess on its upper side beneath the adjacent edge of i said screen for receiving leakage from such edge, and impact members mounted on said screen.

9. In combination, a frame or casing, a removable inclined screen therein comprising a rectangular screen frame and: foraminous cover mounted thereon, and a support for said screen frame comprising a bar or meni said ber nder and extending longitudinally of iti dge, and having an upwardly extending screen frame'and sustaining it, and impact members sustained by said screen.

10. In combinatlon,

11. In combination, a frame or casing, a

removable inclined screen therein comprisprojecting parts afford a. groove .or recess for receiving the 85 plurality of removable mg a screen frame and screen .clothing mounted thereon, and a support for the op posite edges of said screen framecomprising members extending longitudinally of said edges respectively andeach having a projecting flange or part extending within said screen-frame and sustaining the latter, and impact members carried on said screen;

12. In "combination, a frame or casing, a screens therein, each COHlPllSlIlg aforammous screen member and a projecting edge or frame carried thereby, and a support for the adjacent edges of two of said screens, comprising a member extending longitudinally thereof and having or flanges spaced apart to projecting edges or frames of two adjacent screens, said flanges or within the inner sides of said edges or frames and sustaining said screens, and impact members mounted on said screens.

13. In combination, a frame or casing, a plurality of removable inclined. screens therein, supports near the sides of said casing for the inclined edges of said screens re spectively, and a support intermediate of the sides of said casing for the adjacent inclined edges of two of said screens, comprising a downwardly inclined member beneath the edges of two of said screens and having upwardly extending flanges sustaining the adjacent edges of two of said screens respectively,

14. In combination,

screen frames and screen clothing mounted thereon, means supporting said screens near the sides of said casing, a flexible support for said screen's intermediate of said sides, and a stop or abutment above the intermediate part of said screens for limiting upward movement thereof.

15. In combination, a frame or casing, a removable resilient inclined screen therein comprising a rectangular screen frame and screen clothing mounted thereon, a support g n'ge or portion engaging the under side of.

aid

a frame or casing, a' removable inclined screen thereln compris- ;means for saidscreen parts projecting I plurality of removable and impact members mounted on said screens. 7

a frame or casing, re-

movable inclined screens thereincomprising under the edge of said screen, and jarring means above the edge of said screen mounted on said support.

16. In combination, a frame or casing, a removable oblong inclined screen therein, supports under the edge of said screen, and arring means above the longitudinal edge of said screen sustained by said edger.v

17. In combination removable oblong rectangular inclined screen therein, resilient supports under the longitudinal edge of said screen, and jarring 18. In combination, a frame or casing, a removable inclined screen therein, resilient supports under said screen, and jarring means above the ed es of said screen comprising impact mem ers resting thereon.

9 In combination, a frame or casing, an

inclined screen therein, means resiliently supporting said screen, and arring means on the edge of said screen sustained by said supports and means.

- 20. In combination,

removable inclined resilient screen therein, and a plurality'of jarring means spaced apart from one another along the edge of said screen and sustained thereon.

21. In combination, a frame or casing, a

plurality of removable inclined screens resiliently mounted thereon, and each comprising a rectangular frame or casing anda screen clothing stretched thereon, said screens disposed in parallelism, resilient means beneath and supporting adjacent edges of two of said screens, and means for jarring said screens and sustained thereon.

'22. In combination, a frame or casing, a inclined screens or members extendmounted thereon, bars casing beneath and lng transversely of said supporting. said screens and spaced apart from the bottom of said casing, and means above for jarring said screens supported thereby.

23. In combination, a frame or casing, a plurality of removable inclined screens mounted thereon, a bar or member extending transversely of said casing beneath and resiliently supporting the edge of two of said screens, and means for jarring said screens'supported on their edges.

'24. In combination, a frame or casing, a removable inclined screen therein, and impactive jarring means above, opposite, act ing downwardly toward, and sustained by, the edge of said screen.

25. In combination, a frame or casing, a removable inclined screen therein, and jar ring means therefor comprising-removable impact members above the edge of said screen and sustaineitthereby.

26. In combination, a frame or casing, a removable inclined screen exerting an upward stress therein, and comprising a frame a' frame or casing, a

mounted on said edge. I

a frame or casing, a Y

and a screen clothing mounted on top of said frame, means resisting such stress above and opposite and engaging the edge of said screen for limiting its upward movement, and downwardly acting percussive means for jarring said screen acting 1mpactively on the edge of the latter.

27. In combination, a frame or casing, a

faces affording a recess between them, and a swinging striker pivotally mounted in said recess and acting on said faces.

29. In combination, a frame or casing, a screen mounted thereon, and means for jarring said screen comprising a swinging member for depressing said" screen, a stop for arresting upward movement of said screen, and means pressing said screen toward said swinging member.

30. In combination, a frame or casing, an

inclined screen mounted thereon, springs at the edge of said screen for pressing it upwardly, means sustained on the edge of said screen for depressing it, and stops or abutments at the edge of said screen for arresting its upward movement.

31. In combination, a frame or casing, 11 screen or member mounted thereon, and means for moving the latter comprising an axial shaft or stud, an oscillating striker carried thereby, and an impact member mounted on said screen or member and having impact faces disposed at opposite sides of and in approsimately the same plane as the axis of said strikerand acted on by the latter.

32. In combination, a frame or casing, a screen or member mounted thereon, an oscillating part pivotally mounted opposite said screen and having striking faces at each side of its pivotal axis, means causing said screen or member to exert a strem toward said part, and projecting means connected to and screen or member'a'nd enga the striking faces'of said part at opposite sides of its ivotal axis. A

- 33. iii combination, a frame'or, casing, s movable screen or member mounted thereon, an oscillating part and projecting means connected to sa d screen or member straddling the axis of said part and engaged by the latter thereby to move said screen.

. 34. In combination," a screen comprising a woven mesh screen clothing and a frame face of said frame, and means for adjust said frame beneath and on which said clothin is mounted, use means for stretching sa1d clothing compris ing an expansible' transverse member mounted on said frame between the upper and lower faces thereof, and comprising a com-I0 pression member extending from one to the other side of said frame and spaced s art from said screen clothing to afford a c esr-' ance between it and the latter throughout the width of said frame. v

35. In combination, a screen comprising a woven mesh screen clothing and a frame on which said clothin 18 mounted, and means for stretching said clothing comprismg an expansion member crossing saidjo frame mounted thereon above the lower face" thereof, and spaced above the plane of the" lower face of said frame for affording aclearance within the lower side of said frame. 36. In combination, a screen comprising a woven mesh screen clothing and a frame on which said clothin is stretched, and means for stretching said clothing comprising an expansion member mounted on the inner side of said. frame between the up r and lower faces thereof and extending E- tween the sides of said frame beneath and spaced apart from said clothing to afford a clearance between it and thelatter.

37. In combination, a screen com rising a woven mesh screen clothing and a rame on which said clothin is mounted, and means for stretching sai clothing comprising a single compression member mounted on said frame and extending across the latterbeneath and spaced apart from said clothin to afford a clearance beneath the latter, an having ends abutting against said frame above and spaced apart'from the lower face I of said frame to afford a clearance within the latter.

38. .In combination, a screen com rising a woven mesh screen clothing and a tame on which said clothing is stretched, and means for stietching said clothing comprising a compression member crossing said frame beneath and spaced apart from said clothing, and affordinga clearance above the lower ing said member. i

39. In combination, a screen com rising a woven mesh screen clothing and a me on which said clothi is mounted, and means for stretching sai clothing comprising an unyielding compression member crosing U apert from snd a screw or member posit vely.- ,40 In combinations home": ,i sffordmg a scljeenmg removal) 0' chnedsoreenmg mesns; housi' above said screening means providing a ceding chamber, an Inclined member providing a partition between esid'screen said clothing ing and feeding chambers and affording an In Witness whereofllhave hereunto signed outlet from said feeding chamber above said my name in the presence of two subscribing screening means, and a door or cover for said witnesses.

casing below said inclined member affording GEORGE HOLT a ventilating outlet for said screening Witnesses:

ehmnber below said partition, and above said GUSTAV SC ONHEIT,

outlet. ANTONIO BUoNo. 

